PCE-Mediated Multilayer Network Connection Setup
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Solution Overview
Problem
In multilayer networks, establishing connections is hindered when nodes lack route database information, and even with information available, the process is time-consuming due to reliance on local database configurations and algorithms.
Innovation Solution
A method where a Path Computation Client (PCC) requests network route computation from a Path Computation Element (PCE), with the PCE returning path information including all nodes and boundary nodes, allowing intermediate nodes to establish connections without relying on local route databases, using an Extended Region Boundary Object (ERBO) to determine area boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nodes rely on local route database information and RFC4206 algorithms to determine area boundaries, then area boundary determination can be performed independently at each node, but connection establishment fails when nodes lack route database information and the process becomes time-consuming
Solution Approach 1:
The patent introduces a PCE (Path Computation Element) as an intermediary that centralizes route database management and area boundary determination. Instead of requiring each node to independently determine area boundaries using local databases, the PCE computes the complete path and provides boundary node information to intermediate nodes through signaling messages. This mediator approach ensures reliable connection establishment even when individual nodes lack local route database information, while reducing time delays by eliminating repeated local database queries and boundary determination algorithms at each node.
Solution Approach 2:
The PCE performs preliminary computation of the complete network path and identifies all area boundary nodes before connection establishment signaling begins. The boundary node information is pre-calculated and included in the signaling messages sent to intermediate nodes. This preliminary action eliminates the need for intermediate nodes to perform time-consuming local database lookups and boundary determination algorithms during the connection establishment process, significantly reducing overall setup time while ensuring reliability.
2Adaptability or versatility
If each node independently determines area boundaries using local route databases, then nodes maintain autonomy in connection establishment, but the system becomes complex and fails when route databases are centralized
Solution Approach 1:
The PCE acts as a mediator that handles the complex area boundary determination logic centrally. Intermediate nodes no longer need to implement and maintain complex local route database queries and boundary determination algorithms. The PCE receives connection requests, computes the complete path, identifies all area boundary nodes, and provides this information to intermediate nodes through standardized signaling messages. This approach maintains system adaptability to support both centralized and distributed route database architectures while significantly reducing the complexity burden on individual intermediate nodes.
Solution Approach 2:
The patent extracts the complex area boundary determination logic from individual intermediate nodes and consolidates it into the central PCE. The PCE is responsible for computing the complete network path and identifying all area boundary nodes, then providing this extracted boundary information to intermediate nodes through signaling messages. This extraction eliminates the need for each node to maintain and query local route databases for boundary determination, reducing device complexity at intermediate nodes while maintaining architectural flexibility.
Data Source
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AI summary
A method for controlling area boundary, and a method and system for establishing connection in a multilayer network are provided. With a Path Computation Element (PCE) computing a network path and sending response message carrying layer boundary information to a Path Computation Client (PCC), in the present invention, a multilayer network connection can be established rapidly, thereby reducing the time for establishing the multilayer network connection.